HSBoundaryRadiation

This component is a heat structure boundary that applies radiative heat transfer boundary conditions.

Usage

The parameter "hs" specifies the name of the heat structure component, and "boundary" is a list of boundary names on the heat structure where the boundary condition is to be applied.

The parameter "T_ambient" gives the ambient temperature , "emissivity" gives the surface emissivity , and "view_factor" gives the view factor .

The parameter "scale_pp" specifies the name of a post-processor that can scale the boundary conditions.

Input Parameters

  • T_ambientTemperature of environment [K]

    C++ Type:FunctionName

    Unit:(no unit assumed)

    Controllable:No

    Description:Temperature of environment [K]

  • boundaryList of boundary names for which this component applies

    C++ Type:std::vector<BoundaryName>

    Unit:(no unit assumed)

    Controllable:No

    Description:List of boundary names for which this component applies

  • emissivityEmissivity of flow channel [-]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Emissivity of flow channel [-]

  • hsHeat structure name

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:Heat structure name

Required Parameters

  • scale1Function by which to scale the boundary condition

    Default:1

    C++ Type:FunctionName

    Unit:(no unit assumed)

    Controllable:No

    Description:Function by which to scale the boundary condition

  • scale_heat_rate_ppTrueIf true, the scaling function is applied to the heat rate post-processor.

    Default:True

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:If true, the scaling function is applied to the heat rate post-processor.

  • view_factor1View factor function [-]

    Default:1

    C++ Type:FunctionName

    Unit:(no unit assumed)

    Controllable:No

    Description:View factor function [-]

Optional Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

    C++ Type:std::vector<std::string>

    Unit:(no unit assumed)

    Controllable:No

    Description:Adds user-defined labels for accessing object parameters via control logic.

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Set the enabled status of the MooseObject.

If this component is used with a cylindrical heat structure, the post-processor name_integral is added, which gives the heat rate found by integrating this heat flux over the boundary.

Advanced Parameters

Formulation

The heat conduction equation is the following: where

  • is density,

  • is specific heat capacity,

  • is thermal conductivity,

  • is temperature, and

  • is a volumetric heat source.

Multiplying by a test function and integrating by parts over the domain gives where is the boundary of the domain .

For Neumann boundary conditions on the boundary , is replaced with a known incoming heat flux function :

For radiation boundary conditions, the incoming boundary heat flux is computed as

where

  • is the Stefan-Boltzmann constant,

  • is the emissivity of the surface,

  • is the view factor function,

  • is the temperature of the surface,

  • is the ambient temperature, and

  • is an optional scaling factor.